Make src/test/recovery/t/017_shm.pl safe for concurrent execution.

Noah Misch <noah@leadboat.com>

Commit: 3186d5fac55bdba9364ae2daa5b1180c9eaa8968
Author: Noah Misch <noah@leadboat.com>
Date: 2019-04-04T06:16:54Z
Releases: 10.8
Make src/test/recovery/t/017_shm.pl safe for concurrent execution.

Buildfarm members idiacanthus and komodoensis, which share a host, both
executed this test in the same second.  That failed.  Back-patch to 9.6,
where the test first appeared.

Discussion: https://postgr.es/m/20190404020543.GA1319573@rfd.leadboat.com

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src/test/recovery/t/017_shm.pl modified +28 −5

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